Dispensing-pump.



A. J. POCOCK.

DISPENSING PUMP.

APPLICATION FILED JUNE 26. i915.

1,244,077. Ptnted Oct. 23; 1917.

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IIIIIIIIIIig 29 A. J. POCOCK.

DlSPENSING PUMP.

APPLICATION FILED JUNE 26| 195- 1 Q44 07?. Patented Oct. 23,1914.

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DISPENSING-PUMP.

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Specification of Letters Patent.

Patented @ct. 23, 191?.

Application filed June 26, 1915. Serial No. 36,443.,

To all whom it may concern:

Be it known that I, AUGUSTINE J. P0- oooK, a citizen of the 'UnitedStates, residing at Dayton, in the county of Montgomery and State ofOhio, have invented certain new and useful Improvements inDispensing-Pumps; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference beinghad to the accompanying drawings, and to the letters andfigures of reference marked thereon, which form a part of thisspecificatlon.

This invention relates to certain improvements in liquid measuring pumpsand conthe end that the time necessary in the oper.

ation of the pump is economized. This, as well as other advantages, suchas a novel and compact arrangement of the. driving gears and reversingdevices such as cams and clutches, are attained, and thus insure correctquantities at each discharge. These and other objects and advantageswill be more or less emphasized in the description to follow.

Referring to the accompanying drawings which illustrate my improved pumpin detail, Figures 1 and 2 are vertical side and front elevations of thepump in tact; Fig. 3 is an enlarged sectional view of the lower portionof the pump broken at the middle to facilitate illustration; Fig. 4 isan enlarged sectional view on the line aa of the gear box, showing thereversing driving gears and allied parts; Fig. 5 is a side elevation ofthe gears and allied parts, the shafts appearing in section; Fig. 6 isan enlarged sectional view of the vacuum breaker; Fig. 7 is a sectionalview across the piston cylinder on the line bb of Fig. 3; Fig. 8 is asectional detail of the discharge regulating devices on the line 0-0 ofFig. 1.

In a detail description of the invention, similar reference charactersindicate corresponding parts both in the description and drawings.

Referring more particularly to the drawings, 1 designates the pumpcylinder casing mounted on a suitable .base and opposite sides of whichare open to allow access to the interior thereof, said openings in thesides being-closed by plates 22. The top of said cylinder terminates ina head 28 providing a chamber closed by a cylinder cap 46. The liquid isdischarged into said chamher by the upstroke of the piston to be moreparticularly described hereinafter. The lower portion of said cylinderis provided with a liquid inlet 4-3 and a cap-closed hand opening 44:through which access may be had to the suction valve hereinafter moredefinitely described. The piston cylinder 3 is secured between upper andlower flanges 45 and 45', the latter forming the seat for the piston 21.The said cylinder 3 is wrapped by a suitable insulating jacket 1 whichmay consist of acomposition of matter such 'as cork and a suitablebinder which is applied and renewed when necessary through the openingswhich are closed by the side plates 2., Thesaid jacket is designed tomaintain the cylinder at a desirable temperature. The suction valve 25seats in a suitable opening above the inlet space 24.

When not afi'ected by the discharge stroke of the piston 21, the valve25 has its seat and in order to apply a suitable additional pressure onthe valve when seated to maintain an efi'ective seating, a spring 26. ismounted thereon around a suitable projection. A stirrup or frame 23 issecured to the bottom of the piston in a position to en gage said springjust as the piston approaches its seat, therefore, the weight of thepiston and the parts connected thereto is instrumental in insuring suchproper seating of said valve, the spring 26 affording a suitable elasticintervening part. A cylinder inlet or discharge valve 24* is carried bythe piston which opens upon the down-stroke of the piston and closesupon the up-stroke. A rack 8 is suitably connected to the piston rod 22extended from the piston. This rack is held in mesh with its drivinggear by a roller 40. The said rack extends into a gear box 5 which is ofsuitable character to prope* house the driving gears and their allied 1ts, to be presently described. The gear buX 5 ismounted upon the airpipe 30 and discharge pipe 29 both extending from the cylinder head 28.The rack 8 gears with its driving gear 9 which is pinned to shaft 6journaled in the top of the gear box 5. The gear 9.is driven in oppositedirections by gears 10 and 12 the former of which is mounted on shaft 7journaled in the gear box and the latter, to-wit, gear 12 is fixed tosaid gear 9 and to the shaft. 6. A pinion 11 also runs on shaft 7 andmeshes with the gear 12. The gear 9 is driven in reverse directions bygears 10 and 11 and these are controlled by clutch members 15 and 16which are fixed, respectively, to said gears. Cooperating with saidclutch members 15 and 16 are clutch members 14 and 17, re-

spectively, whicheare slidable on shaft 7.

The outer ends of said clutch members 14 and 17 have each a spiral slotwhich provide inner and outer cam surfaces 19 and 19 and end abutments18 and 18'. The clutch members 14 and 17 are slid on the shaft 7 androtated by double-acting cams or dogs and 20' fixed to said shaft. Thesliding or reciprocating movement is imparted by alternate engagementswith the inner and outer inclined surfaces 19 and 19 and the rotarymovement takes place when said cams engage the abutments l8 and 18.Means are provided for preventing the clutch members 14 and 17 rotatingwhile the cams 20 and 20 are moving against the inclined surfaces 19 and19 and until the abutments 18 and 18 are engaged. Such means consist ofbrake shoes 31 which are arranged to engage the annular surfaces 31 ofsaid clutch members. These friction shoes are suitably mounted on arms32 that are in turn conveniently mounted on the frame of the pump, asshown in Fig. 5, and connected by a cross bar 32. Suitable pressure isapplied to said shoes by springs 33 which are attached at one end to thearms 32 and the other ends of which have an adjusting connection 34 to aconvenient part of the frame. From the foregoing description, it will beseen that the rack 8 and therewith the pump piston are givenreciprocatory movement from the gear 9 which is always in engagementtherewith, one direction of movement being imparted from the crankhandle 35 pinned to shaft 7, clutch tit? members 14 and 15, and gear 10,and the other direction of movement beingimparted through clutch members16 and 17 and gears Hand 12. Owing to the differential of the gears, theidle stroke of the piston is obtained in a much briefer space of time.The discharge pipe 29 communicates with a chambered head 34 from whichthe discharge spout 36 extends, which in turn discharges through a hose(not shown). The discharge of the oil or liquid through said spout andhose has a tendency to siphon and to thereby interfere with correctdischarges or measurements. Tnasmuch, however, as

meant? siphoning cannot occur without what is commonly termed a vacuumat the head of the discharge pipe, I have provided what may be termed avacuum breaker as a preventive consisting of a diaphragm 37 mounted inthe top of the head 34 and having an orifice 38 and a button 39 ofsuitable material such as leather secured to the cap of said head. Bythe said. diaphragm "closing against said button, the exclusion of airfrom the chamber below takes place, thereby constituting what may betermed an automatic vacuum breaker. The discharge stroke of the pistonis regulated through stops 41 arranged at suitable points along a rod 42mounted between the head 28 and gear box 5. These stops may limit thepiston to a one-half gallon, gallon, two gallon, and two and a halfgallon stroke, and the rod 42 is turned to bring said stops in or out ofalinement with a shoulder 47 on the lower end of the rack 8. Suchoperation is given said rod 42 by means of a hand rod or bar 48 suitablymounted. When a particular stop 41 is placed in position, it may belocked and sealed in such position. This is accomplished by means of aseries of members 49, one connected to each stop 41. The said members 49have a screw-threaded connection with a rod 50 mounted adjacent to andparallel with the stop rod'42. The said members 49 have each a series ofrecesses 51 in which a sealing rod 52 lies. This rod may be sealed inany suitable manner. In the drawings T have shown the end thereofprojected through an opening in a lug 53 on a side of the screening orfiltering case 54.

Having described my invention, ll claim.

1. In a pump of the type specified, the combination with a pumpcylinder, a piston therein, and a rack connected to the rod of saidpiston, of an oblong gear box into which said rack projects the uppertransverse area of which is less than the transverse area of the lowerportion of said gear box, transverse gear shafts mounted in said box, adriving gear mounted on the upper shaft and adapted to drive said rackin one direction, another gear on said upper shaft and adapted to drivethe rack gear in a reverse direction, gears on the lower shaft meshingwith those on the upper shaft,

clutches on said lower shaft members connected to the gears on saidlower shaft and the other members of which are slidable on said lowershaft, said slidable clutch members having cam slots terminating in endabutments, and actuating cams fixed to said lower shaft and extendinginto said slots, said cams being adapted to impart longitudinal androtary movements to the slidable clutch members to alternately engageand disengage the clutch members on said gears, substantially asspecified.

2. Tn a pump of the type specified,the

combination with a pump cylinder, a piston therein, and a rack connectedto the rod of said piston, of an oblong gear box into Which said rackprojects the upper transverse area of which is less than the transversearea of the lower portion of said gear box, transverse gear shaftsmounted in said box, a driving gear mounted on the upper shaft andadapted to drive said rack in one direction, another gear on said uppershaft and adapted to drivethe rack gear in a reverse direction, gears onthe lower shaft meshing with those on the upper shaft, clutches on saidlower shaft members which are connected tothe gears on saidlower shaftand the other members of which are slidable on said lower shaft, saidloose clutch members having cam slots terminating in end abutments,actuating projections fixed to the lower shaft and extending into saidslots, said projections being adapted to impart slidable movement tosaid clutch members by engaging the sides of said slots and rotarymovement by engaging the end abutments of said slots; and frictiondevices holding said slidable clutch members from rotation until theclutches engage, substantially as specified.

3. In a pump, the combination with a piston and a driving rack connectedthereto, of a main driving gear in mesh with said rack and impartingthereto reciprocating movement at different speeds, a driving gearrotatable on the axis common to the main driving gear and adapted toimpart one of such movements to said rack through said main drivinggear, a driving gear in mesh with said main driving gear and adapted toimpart to said rack through said main driving gear a reverse andvariable movement to said rack, an mtermediate gear 1n mesh with thegear which rotates on the common axis with the main gear, clutchmembers" fixed to said intermediate gear and tothe gear in mesh withsaid main driving gear, and means for alternately imparting slidablemovement to said clutch members, and rotary movement through therotation of the shaft upon which said last named gears are mounted.

4. In a pump, the combination with a piston and a driving rack connectedthereto, of a main driving gear 9 imparting to said rack reciprocatingmovement at variable speeds, a gear 12 imparting to said driving gearone of said speeds, a non-alined gear 10 imparting to said gear 9 theother of said speeds, a gear 11 in mesh with the gear 12, fixed andmovable clutch members 14 and 15 for driving thegear 10, fixed andmovable clutch members 16 and 17 for driving the gear 11, and camdevices cooperating with the movable clutch members to impart slidablemovement thereto to engage and disengage the respective gears 10 and 11and to rotate one or the other of such gears when engaged. I

In testimony whereof, I afiix my signature. v 1 AUGUSTINE J. POCOQK.

